So, I ditched SBC Yahoo DSL the other day and got Comcast hispeed. I get 8,131kb/s dl and 1,215 kb/s....

...but the problem is whenever I download large files the internet connection goes out sometimes. Even uTorrent gets fast speed at the beginning and just dies all the time. Anyone have anyways to fix this issue? I keep reading about portfoward.com fix. I have a WCG200 modem.